The upgrades are expected to generate on average 1.5 percent in additional energy production, estimated at a total of 13.5 GWh a year, Vestas said in a statement.
It will use the PowerPlus program to increase a wind power plant's energy production and efficiency through site-specific optimization of operational parameters, implementation of intelligent software algorithms or enhanced aerodynamic performance.
"We are thrilled to upgrade IKEA Group's existing energy assets and support them in reaching their target of powering their production and consumption with renewable energy," said Mariel Alexandra Garrido Urena, Head of Fleet Optimisation in Vestas.
She added Vestas continues to innovate and develop solutions that can increase energy production, which also means that already operating turbines can be upgraded to yield even more energy.
IKEA Group has an ambitious goal of producing as much renewable energy as they consume by 2020.
Under the agreement, Vestas will upgrade six different turbine types in the U.S., Sweden, France, and Poland, and this includes V80-2.0 MW, V90-2.0 MW, V90-3.0 MW, V100-2.0 MW, V112-3.0 MW and V112-3.3 MW turbines.